I can tell you about my experiences with the IS87.
It's a super easy board to ride. Nothing technical about it and I'm no pro.
I use it with 5.0 and 5.7 sails.
It flies over chop and if I have to, I found it not too difficult to jump as well.

If you take a look at the dimensions of an IS87, a Kode 86 and a Kode 80